Broadband Achromatic Anomalous Mirror in Near-IR and Visible Frequency Ranges

Andrei Nemilentsau, Tony Low

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

An anomalous achromatic mirror operating in the near-IR and visible frequency ranges was designed using an array of metal-insulator-metal (MIM) resonators. An incident wave interacting with the MIM resonator experiences phase shift that is equal to the optical path traveled by the gap plasmon excited by the wave. A phase gradient along the mirror surface is created through the difference in plasmon optical paths in the resonators of varying lengths. In a frequency region well below the plasma frequency of metal, the phase gradient is a linear function of frequency, and thus the mirror operates in the achromatic regime; that is, the reflection angle does not depend on the radiation frequency. Using silver-air-silver resonators, we predicted that the mirror can steer a normally incident beam to angles as large as 40° with high radiation efficiency (exceeding 98%) and small Joule losses (below 10%). Our study indicates that it is feasible to create an efficient broadband anomalous mirror.

Original languageEnglish (US)
Pages (from-to)1646-1652
Number of pages7
JournalACS Photonics
Volume4
Issue number7
DOIs
StatePublished - Jul 19 2017

Keywords

  • achromatic reflection
  • anomalous mirror
  • gap plasmons
  • gradient metasurface
  • metal-insulator-metal resonators

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